Answer:
- <u>Because the atoms of the elements only emit some specific frequencies of light.</u>
Explanation:
The spectra lines are the result of the emission of different frequencies of light (electromagnetic radiation) from the atoms of an element when some electrons decay from an upper (excited) energy level to a lower energy level.
The fact that certain regions do not show lines means that the spectrum is not continuos but discrete. This is, only some specific frequencies of light are emitted.
The frequency of the light is related with the energy per the Einstein-Planck´s equation:
Where h is Planck's constant and f is the frequency of the electromagnetic wave (light).
Thus, it is concluded that only photons with certain specific energies are emitted.
This is what is meant when you say that the light has dual behavior: as wave and as particle: the light is emitted in packages named quanta.
The emission spectrum is a demostration of the discrete (quantized) nature of the light.
Answer:
Explanation:Until the past decade, scientists, research institutions, and government agencies relied solely on a system of self-regulation based on shared ethical principles and generally accepted research practices to ensure integrity in the research process. Among the very basic principles that guide scientists, as well as many other scholars, are those expressed as respect for the integrity of knowledge, collegiality, honesty, objectivity, and openness. These principles are at work in the fundamental elements of the scientific method, such as formulating a hypothesis, designing an experiment to test the hypothesis, and collecting and interpreting data. In addition, more particular principles characteristic of specific scientific disciplines influence the methods of observation; the acquisition, storage, management, and sharing of data; the communication of scientific knowledge and information; and the training of younger scientists.1 How these principles are applied varies considerably among the several scientific disciplines, different research organizations, and individual investigators.
Answer:
A
Explanation:
A man has to give 23 and women has to also give 23.
Answer:
F
Explanation:
nonmetal doesn't conduct, is shiny and silver and is solid. Hope this helps :)